KR100203202B1 - Colorant resin composition having resistance to chlorine-containing water, and molded articles thereof - Google Patents

Abstract

A molded article or water conduit that does not cause spotted bumps or small diameter bubbles on the surface of the molding when it is in contact with the chlorine-containing water, the molding being a resin containing a polyolefin resin, a pigment and a copolymer resin. Obtained from the composition, the copolymer resin is prepared from monomers having α, β-unsaturated double bonds and dibasic acids having unsaturated double bonds or anhydrides thereof.

Description

Colored resin composition and its molded article which are resistant to chlorine-containing water {COLORANT RESIN COMPOSITION HAVING RESISTANCE TO CHLORINE-CONTAINING WATER, AND MOLDED ARTICLES THEREOF}

The present invention relates to colorant resin compositions for producing colored resin moldings which are in direct contact with chlorine-containing water. More specifically, the present invention relates to a colorant resin composition which is resistant to chlorine-containing water and which can provide a molding which does not cause dot-like projections or small diameter bubbles on the surface of the molding when the molding contacts the chlorine-containing water. .

To prepare colored moldings made of polyolefin resins such as polyethylene, polypropylene, etc., polyolefin resins may be used as inorganic pigments such as zinc oxide, titanium oxide, red iron oxide, ultramarine or cobalt blue, azo, quinacridone, anthra Coloring using organic pigments such as quinone, perylene, isoindolinone, phthalocyanine, dioxazine, indanthrene, perinone or quinophthalone pigments or dyes such as azo, anthraquinone, perylene, perinone or thioindigo pigments Let's do it.

When molded articles made of the polyolefin resin containing the pigments or dyes are used in the fields in which the molded articles are in direct contact with chlorine-containing water such as, for example, water pipes, bubbles or dots of small diameter (hereinafter referred to as bubbles) are referred to as bubbles. ) Occurs on the surface of the molded article and partially peeled off so that it is contained in water.

In particular, since water is used for drinking and drinking water, water pipes should be able to strictly prevent the generation of bubbles in accordance with the standards provided by JIS K6762.

Therefore, double-layer pipes have been proposed in which the inner layer in direct contact with the chlorine-containing water does not contain a pigment and the pigment is included in the outer layer. However, compared with single-layer pipes, the double-layer pipes are difficult to manufacture and require special molding machines. It is also difficult to manufacture double-layered connections that connect pipes together. Therefore, there is a need for the development of colored resin compositions capable of providing molded articles having excellent resistance to chlorine-containing water.

It is an object of the present invention to provide a colorant (colored) resin composition that is resistant to chlorine-containing water, thereby solving the above problems and providing a molded article excellent in resistance to chlorine-containing water.

According to one aspect of the present invention, there is provided a colorant (colored) resin composition resistant to chlorine-containing water,

The resin composition comprises 100 parts by weight of polyolefin resin, 0.01-10 parts by weight of pigment and 0.005-10 parts by weight of copolymer resin,

The copolymer resin is obtained from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof.

According to two aspects of the present invention, there is also provided a resin composition, in particular a colorant resin composition, resistant to chlorine-containing water,

The resin composition comprises 100 parts by weight of polyolefin resin, 0.1-100 parts by weight of pigment and 0.05-100 parts by weight of copolymer resin,

The copolymer resin is obtained from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof.

According to the three aspects of this invention, the water supply pipe made from the said colored resin composition is further provided.

Polyolefin resins used in the present invention include polyethylene, polypropylene and polybutene. Of these, polyethylene and polybutene are preferred. Polyethylenes include several types of polyethylenes, such as high-density (H) polyethylenes, low-density (L) polyethylenes, and linear low-density (LL) polyethylenes. In general, high-density (H) polyethylene is used to make water pipes with large diameters, and linear low-density polyethylene is used to make water pipes with small diameters.

The pigments used in the present invention include inorganic pigments such as zinc oxide, titanium oxide, red iron oxide, ultramarine and cobalt blue, and azo, quinacridone, anthraquinone, perylene, isoindolinone, phthalocyanine, dioxazine, indanthrene, Organic pigments such as perinone and quinophthalone pigments. In general, the water pipes are colored blue to give an image of water, which is intended to identify them as green-colored gas-supply pipes or others. For this reason blue dyes such as ultramarine, cobalt blue, phthalocyanine pigments and indanthrene pigments are used, in particular phthalocyanine blue pigments and indanthrene blue pigments.

The phthalocyanine blue pigment used in the present invention has the following compositional formula, and these molecules contain an average of 0-8 chlorine atoms. Furthermore, in the formula (1), it is generally preferred that M is a hydrogen atom or one element of Cu, Zn, Ni and Fe and M is Cu in terms of color and cost.

[Formula 1]

However, M is a hydrogen atom or one element of Cu, Zn, Ni and Fe, and each of X ₁ -X ₄ is a chlorine atom and the total number of X ₁ + X ₂ + X ₃ + X ₄ is 0-8.

In the composition formula (1), M is preferably Cu in terms of coloring, and the total number of X ₁ + X ₂ + X ₃ + X ₄ is preferably 2-4 in terms of heat resistance and color.

The indanthrene blue pigment used in the present invention has the following formula (2).

[Formula 2]

Dyestuffs may use dyes to enhance transparency and clarity, but the dyes need to be insoluble in water.

The resin composition resistant to chlorine-containing water provided by the present invention is a copolymer resin obtained from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof (hereinafter, a copolymer). Resin). The copolymer resin has a high affinity for the pigment and penetrates well onto the pigment surface. Thus, the copolymer resin can be sufficiently formed on the surface of the pigment to prevent the chlorine-containing water from contacting the pigment when the chlorine-containing water directly contacts the molded article in the molded article, thereby preventing or preventing the formation or peeling of bubbles. It is.

The copolymer resin preferably has a weight average molecular weight of 5,000-50,000, more preferably 10,000-30,000. When the weight average molecular weight of the copolymer exceeds the upper limit, there may be a problem in manufacturing a so-called master batch containing a high density pigment, which will be described later. If the weight average molecular weight is below the lower limit, the article molded as the final product may be affected in some cases.

The copolymer resin preferably has an acid value of 50-800, more preferably 100-500. When the acid value of the copolymer resin is less than or equal to the lower limit, the copolymer resin does not show sufficient affinity for the pigment and does not sufficiently cover the pigment surface, and thus it is difficult to prevent bubbles. When the acid value exceeds the upper limit, the copolymer resin easily absorbs moisture and exhibits high adhesion to metal, and the extrusion processability of the resin composition is likely to be affected.

The copolymer resin preferably has a melt viscosity of 1,000-20,000 poise, more preferably 2,000 -9,000 poise. These melt viscosity values mean the values obtained by measuring with the flow tester at 160 degreeC. When melt viscosity is below the said lower limit, it is difficult to disperse a pigment. When the melt viscosity exceeds the upper limit, coating of the pigment surface with the copolymer resin is difficult, and therefore the melt viscosity is preferably in the range of 1,000-20,000.

The copolymer resin can be produced, for example, by the method disclosed in JP-A-5-202234.

For example, monomers having α, β-unsaturated double bonds are not particularly limited, and α-olefins, diolefins, allyl monomers, N-vinyl monomers, vinyl ethers, vinyl sulfides, (meth) acrylic acid ester monomers and other It is selected from a copolymerizable vinyl monomer or a vinylidene monomer. Such monomers may be used alone or in combination. Of these, α-olefins are particularly preferred.

Specific examples of the α-olefins include ethylene, propylene, butylene, isobutylene, pentene, 1-hexene, 1-heptene, 1-octene, 1-nonene, 1-dekene, 1-dodekene, 1-tetradeken , 1-hexadecene, 1-octadecene, 1-eicosene, 1-docosene, 1-tetracosene, 1-hexacosene, 1-octacosene, 1-triacontene, 1-dotriacontene, 1- Tetratricontent, 1-hexatricontent, 1-octatriacontent, 1-tetracontent and mixtures of at least two members. The α-olefins also include Dialene 128 (C ₁₂ -C ₁₈ ), Dialene 208 (C ₂₀ -C ₂₈ ) and Dialene 39 (minimum C ₃₀ ) (provided by Mitsubishi Chemical Co., Ltd.) and VYBAR 2600 (molecular weight) 2,600) and VYBAR 2800 (molecular weight 2,800) (provided by Toyo Petrolite). In view of preventing and preventing bubbles and their exfoliation in molded articles, α-olefins having 10-20 carbon atoms are preferred, and α-olefins having 12-14 carbon atoms are particularly preferred.

As the number of carbon atoms in the α-olefin increases, the melt viscosity of the copolymer resin obtained from the α-olefin decreases. Based on the melt viscosity, the wettability to the pigment is increased and the coating effect of the copolymer resin on the pigment is enhanced.

However, as the number of carbon atoms of the α-olefin increases, the acid value of the copolymer resin obtained from the α-olefin decreases, the affinity between the copolymer resin and the pigment decreases, and the wettability of the copolymer resin to the pigment decreases. do. As a result, the coating of the pigment is insufficient with the copolymer resin, and there is a tendency for the inhibition or prevention effect of the generation and separation of bubbles to be inferior.

On the other hand, as the number of carbon atoms of the α-olefin decreases, the acid value of the copolymer resin obtained from the α-olefin increases, the affinity between the copolymer resin and the pigment increases, and the wettability of the copolymer resin to the pigment increases. do. Therefore, it is expected that the formation and peeling of bubbles in the molded article will be inhibited or prevented based on coating the pigment with the copolymer resin. However, as the number of carbon atoms of the α-olefin decreases, the melt viscosity of the copolymer resin increases and, based on the melt viscosity, the wettability to the pigment decreases, and the coating effect of the copolymer resin on the pigment also decreases. do.

The wettability of the copolymer resin with respect to the pigment, i.e. coating the pigment with the copolymer resin, takes into account both the acid value and the melt viscosity of the copolymer resin, resulting in α- having 10-20 carbon atoms to obtain the copolymer resin. Preference is given to using olefins or particularly to using α-olefins having 12-14 carbon atoms.

Considering monomers having α, β-unsaturated double bonds in addition to α-olefins, the diolefins include butadiene, isoprene, neoprene, chloroprene and mixtures of at least two members.

Allyl monomers include allyl acetate, isopropenyl acetate, allyl chloride, isopropenyl chloride, trans-propenyl chloride, cis-propenyl chloride and mixtures of at least two members.

N-vinyl monomers include N-vinyl carbazole, N-vinyl-2-pyrrolidone, N-vinylphthalimide and mixtures of at least two members.

Vinyl ethers include linear or branched aliphatic alkyl vinyl ethers such as ethyl vinyl ether, propyl vinyl ether, isobutyl vinyl ether and hexyl vinyl ether, p-dioxenes and mixtures of at least two members.

Vinyl sulfides include ethyl vinyl sulfides, phenyl vinyl sulfides and mixtures thereof.

(Meth) acrylic acid ester monomers are linear or branched aliphatic alcohols such as methyl acrylate, ethyl acrylate, butyl acrylate, hexyl acrylate, octyl acrylate, 2-ethylhexyl acrylate, decyl acrylate and dodecyl acrylate. Acrylic esters, methacrylic acid esters corresponding to the acrylic esters, and mixtures of at least two members.

Other copolymerizable vinyl monomers or vinylidene monomers include vinyl esters, vinylpyridine, vinyl acetate, vinyl propionate, styrene, α-methylstyrene, β-methylstyrene, acrylonitrile, methacrylonitrile, vinylidene chloride and At least two membered mixtures.

Dibasic acids having an unsaturated double bond or anhydrides thereof include maleic acid, fumaric acid, itaconic acid, crotonic acid, citraconic acid, maleic anhydride, itaconic anhydride and citraconic anhydride. The dibasic acids may be used alone or in combination. Maleic anhydride is industrially useful.

The copolymer resin is one of solution polymerization, bulk polymerization, emulsion polymerization, suspension polymerization and dispersion polymerization from monomers having α, β-unsaturated double bonds and dibasic acids having unsaturated double bonds or anhydrides thereof. It can be prepared as, the method is not limited to these. Polymerization initiators used in the preparation include peroxides such as benzoyl peroxide, lauryl peroxide, cumene peroxide, diisopropyl peroxycarbonate, di-tert-butyl peroxide and tert-butylperoxybenzoate, azobisisobuty Azo compounds such as ronitrile and azobis-2,4-dimethylvaleronitrile.

The resin composition resistant to chlorine-containing water, provided by the present invention, is a pellet (hereinafter, sometimes referred to as a colored pellet) used directly for molding, or a so-called master batch containing a high concentration of pigment (hereinafter referred to as master batch). It may be in the form. The master batch is diluted with polyolefin resin and the resulting mixture is molded to provide a molded article.

In the colorant (colored) resin composition provided in the present invention, which is resistant to chlorine-containing water, the pellets (i.e., colored pellets) used directly for molding include 100 parts by weight of polyolefin resin, 0.01-10 parts by weight of pigment and copolymer resin. It is preferable to include 0.005-10 parts by weight, and the copolymer resin is obtained from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof.

When the pigment amount is less than 0.01 part by weight, only a very light-colored state is obtained. When the amount of pigment exceeds 10 parts by weight, it is easy to impair the mechanical properties of the article in which the pigment is molded. When the amount of the copolymer resin is less than 0.005 parts by weight, the effect of resistance to chlorine-containing water almost disappears. When the amount of the copolymer resin exceeds 10 parts by weight, the copolymer resin is poor in compatibility with the polyolefin resin, and therefore, the mechanical properties of the molded article are likely to be impaired.

Furthermore, in order to completely coat the pigment surface with the copolymer resin, the amount of the copolymer resin is preferably at least 1/2 of the pigment weight.

When the resin composition of the present invention is prepared in a master batch, the resin composition preferably comprises 100 parts by weight of polyolefin resin, 0.1-100 parts by weight of pigment and 0.05-100 parts by weight of copolymer resin, wherein the copolymer resin is α, It is obtained from a monomer having a β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof.

When the amount of the pigment is 0.1 parts by weight or less, it is difficult for the molded article to have an appropriate coloring state. When the pigment amount exceeds 100 parts by weight, the pigment dispersion in the master batch becomes insufficient. When the amount of the copolymer resin is 0.05 parts by weight or less, there is little resistance effect on the chlorine-containing water. When the amount of copolymer resin exceeds 100 parts by weight, granulation of the master batch is difficult.

Furthermore, the amount of the copolymer resin for total coating of the pigment surface with the copolymer is preferably at least 1/2 of the weight of the pigment.

The master batch is diluted with polyolefin resin and the mixture is molded to obtain a molded article. The polyolefin resin used in the dilution is the same or similar to the polyolefin resin used to prepare the master batch.

The mixture (diluted master batch) for preparing the article shaped into the final product, as in the case of pellets molded directly without dilution, preferably comprises 100 parts by weight of polyolefin resin, 0.01-10 parts by weight of pigment and the copolymer resin 0.005-10 parts by weight, wherein the copolymer resin is obtained from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof.

When comparing the master batch and the colored pellets, their manufacturing steps are almost insignificant, and the master batch is more expensive since the master batch contains a higher concentration of pigment. However, the master batch is diluted to 0.5-200 parts by weight of the cheap polyolefin resin based on the master batch to produce the molded article. When comparing articles molded into the final product, it is desirable to produce molded articles from a master batch diluted with polyolefin resin, because molded articles made by diluting the master batch with polyolefin resin are less expensive. .

Colorant (coloured) resin compositions resistant to chlorine-containing water, provided by the present invention, can shape articles in the form of films, sheets, plates, containers, pipes or fibers. Furthermore, the colorant (colored) resin composition of the present invention has excellent resistance to chlorine-containing water and thus can be preferably used in the manufacture of water pipes. The term pipe as used in the present invention includes the pipe itself and the parts (connecting pipes) used to connect the pipes.

The colorant (colored) resin composition of the present invention may contain metal soaps, intermediates or dispersants such as polyethylene having a low molecular weight, antioxidants and ultraviolet absorbers in an amount that will not impair the effects of the present invention as needed. .

Example

Hereinafter, the present invention will be described in detail by way of examples. First, a method for producing a copolymer resin from monomers having α, β-unsaturated double bonds and dibasic acids having unsaturated double bonds or anhydrides thereof will be described. In the examples below,% means% by weight and parts by weight.

Preparation Example 1

The flask was charged with 650 g of α-olefin having 12-14 carbon atoms, 4.4 g of di-tert-butyl peroxide and 14 g of toluene and the atmosphere in the flask was replaced with nitrogen. While the mixture was stirred under heating at 150 ° C., a total of 350 g of 11.7 g of maleic anhydride was added every 2 minutes and 4.4 g of 1.1 g of di-tert-butyl peroxide added every 20 minutes. After addition, 1 g of di-tert-butyl peroxide was added and the mixture was kept at 160 ° C. for further 6 hours to react the mixture. After completion of the reaction, the hot contents were recovered and cooled to solid to obtain a copolymer resin having a weight average molecular weight of 17,000, an acid value of 400 and a melt viscosity of 3,000 poise (measured by a flow tester at 160 ° C.).

Preparation Example 2

The flask was charged with 50 g of α-olefin with 10 carbon atoms, 930 g of α-olefin with weight average molecular weight 2,600, 0.44 g of di-tert-butyl peroxide and 1.4 g of toluene and the atmosphere in the flask was replaced with nitrogen. While the mixture was stirred under heating at 150 ° C., a total of 35 g of 1.17 g of maleic anhydride was added at two minute intervals and 0.44 g of a total of 0.11 g of di-tert-butyl peroxide was added at 20 minute intervals. After addition, 0.1 g of di-tert-butyl peroxide was added and the mixture was kept at 160 ° C. for 6 hours to react the mixture. After the reaction was completed, the hot contents were collected and cooled to solid to precipitate a copolymer resin having a weight average molecular weight of 18,000, an acid value of 100 and a melt viscosity of 4,000 poise (measured by a flow tester at 160 ° C.).

Preparation Example 3

The flask was charged with 595 g of α-olefin with 10 carbon atoms, 4.0 g of di-tert-butyl peroxide and 14 g of toluene and the atmosphere in the flask was replaced with nitrogen. While the mixture was stirred at 150 ° C. under heating, a total of 405 g of maleic anhydride was added at 13.5 g at 2 minute intervals and a total of 4.0 g at 1.0 g at 20 minute intervals for di-tert-butyl peroxide. After addition, 1.0 g of di-tert-butyl peroxide was added and the mixture was kept at 160 ° C. for 6 hours to react the mixture. After the reaction was completed, the hot contents were collected and cooled to solid to precipitate a copolymer resin having a weight average molecular weight of 22,000, an acid value of 460, and a melt viscosity of 18,000 poise (measured by a flow tester at 160 ° C.).

Preparation Example 4

The flask was charged with 1276 g of α-olefin having 20-28 carbon atoms, 3.6 g di-tert-butyl peroxide and 14 g toluene and the atmosphere in the flask was replaced with nitrogen. While the mixture was stirred at 150 ° C. under heating, a total of 412 g of maleic anhydride was added at 13.7 g at 2 minute intervals and 1.8 g at 0.9 g at 20 minute intervals for di-tert-butyl peroxide. After addition, 1 g of di-tert-butyl peroxide was added and the mixture was kept at 160 ° C. for 6 hours to react the mixture. After the reaction was completed, the hot contents were recovered and cooled to solid to precipitate a copolymer resin having a weight average molecular weight of 5,500, an acid value of 270 and a melt viscosity of 1,500 poise (measured by a flow tester at 160 ° C).

Example 1

50 g of the resin obtained in Preparation Example 1 and 50 g of phthalocyanine blue (Pigment Blue 15: 3) were kneaded with a mixer to obtain a master batch intermediate. Then 100 parts of high-density polyethylene (MFR = 0.062 g / 10 min (190 ° C., 2.16 kgf), density 0.952 g / cm ² ) and 3.2 g of the master batch intermediate were mixed with a Henschel mixer and the mixture was mixed. Extruded at 220 ° C. with a single-screw extruder to form strands. The strand was cooled and pelletized to obtain a master batch. A test plate was then prepared by mixing 100 parts of high-density polyethylene and 5 parts of the master batch and injection molding the mixture with an injection molding machine. The test plate was tested for resistance to saline-containing water under the following conditions according to JIS K6762 in order to detect the state of bubble generation. Table 1 shows the results.

ㆍ Test Condition

Chlorine Concentration: 2,000 ± 100ppm

Temperature: 60 ℃

Immersion time: 168 hours

ㆍ rating

1 = small-diameter bubbles with a minimum of 10 dot-like protrusions or a minimum 0.4 mm diameter were found within the 1 cm 2 area of the plate surface.

Small-diameter bubbles with 2 = 4-10 dot-like protrusions or at least 0.4 mm diameter were found within 1 cm 2 area of the plate surface.

Small-diameter bubbles with 3 = 3 or 2 dot-like protrusions or at least 0.4 mm diameter were found within 1 cm 2 area of the plate surface.

Small-diameter bubbles with 4 = 1 to 0 dot-like protrusions or at least 0.4 mm diameter were found in the 1 cm 2 area of the plate surface.

Example 2

A master batch was prepared in the same manner as in Example 1 except that 50 parts of the resin prepared in Preparation Example 1 was replaced with 25 parts of polyethylene having a low molecular weight and 25 parts of the resin obtained in Preparation Example 1. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 3

A master batch was prepared in the same manner as in Example 2 except that the amount of the master batch intermediate was changed to 1.6 parts instead of 3.2 parts. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 4

A master batch was prepared in the same manner as in Example 2 except that the amount of the master batch intermediate was changed to 0.5 parts instead of 3.2 parts. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 5

A master batch was prepared in the same manner as in Example 2 except that the amount of the master batch intermediate was changed from 3.2 parts to 10 parts. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 6

A master batch was prepared in the same manner as in Example 1, except that 50 parts of the resin obtained in Preparation Example 1 was replaced with 50 parts of the resin prepared in Preparation Example 2. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 7

A master batch was prepared in the same manner as in Example 1 except that the amount of the master batch intermediate was changed from 3.2 parts to 20 parts. Ten parts of the master batch were prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 8

A master batch was prepared in the same manner as in Example 2 except that the amount of the master batch intermediate was changed from 3.2 parts to 0.8 parts. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 9

A master batch was prepared in the same manner as in Example 1 except that phthalocyanine blue was replaced with indanthrene blue (Pigment Blue 60). The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 10

100 parts of high-density polyethylene (MFR = 0.062 g / 10 min (190 ° C., 2.16 kgf), density 0.952 g / cm ² ), 1.6 parts of resin obtained in Preparation Example 1 and 1.6 parts of phthalocyanine blue (Pigment Blue 15: 3) Mix and knead the mixture and granulate at 220 ° C. with a single-screw extruder to obtain colored pellets. The colored pellet was then transferred to an injection molding machine to obtain a test plate, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the state of bubble formation. Table 1 shows the results.

Example 11

Coloring pellets were obtained in the same manner as in Example 10 except for replacing phthalocyanine blue with indanthrene blue (Pigment Blue 60). Thereafter, the colored pellet was transferred to an injection molding machine to obtain a test plate, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 12

A master batch was prepared in the same manner as in Example 1, except that 50 parts of the resin obtained in Preparation Example 1 was replaced with 50 parts of the resin obtained in Preparation Example 3. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Example 13

A master batch was prepared in the same manner as in Example 1, except that 50 parts of the resin obtained in Preparation Example 1 was replaced with 50 parts of the resin obtained in Preparation Example 4. The master batch was prepared using the same method as in Example 1, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

Comparative Example 1

A master batch was prepared in the same manner as in Example 1, except that 50 parts of the resin obtained in Preparation Example 1 was replaced with 50 parts of polyethylene having a low molecular weight. A test plate was prepared using the same method as in Example 1 for the master batch, and the test plate was tested for resistance to chlorine-containing water in the same manner as in Example 1 to see the bubble generation state. Table 1 shows the results.

evaluation evaluation evaluation Example 1 4 Example 6 3 Example 11 4 Example 2 4 Example 7 4 Example 12 3 Example 3 4 Example 8 4 Example 13 3 Example 4 4 Example 9 4 Comparative Example 1 One Example 5 4 Example 10 4

According to the above results, it can be seen that the present invention can provide a colorant (colored) resin composition having resistance to chlorine-containing water and to provide a molded article excellent in resistance to chlorine-containing water.

Claims (20)

Resistant to chlorine-containing water, A resin composition comprising 0.005 to 10 parts by weight of a polyolefin resin, 0.01 to 10 parts by weight of a pigment and a copolymer resin prepared from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof. The resin composition according to claim 1, wherein the monomer having an α, β-unsaturated double bond is a copolymerizable α-olefin. The resin composition according to claim 1, wherein the dibasic acid or anhydride having an unsaturated double bond is maleic acid or maleic anhydride. The resin composition according to claim 1, wherein the copolymer resin is a copolymer prepared from α-olefin and maleic anhydride having 10 to 20 carbon atoms. The resin composition of claim 1, wherein the pigment is a blue pigment. 8. The resin composition of claim 7, wherein the blue pigment is a phthalocyanine blue pigment and / or an indanthrene blue pigment. The resin composition according to claim 8, wherein the phthalocyanine blue pigment is a phthalocyanine copper blue pigment. Water pipe obtained by molding the resin composition of claim 1 The water pipe of claim 10, wherein the water pipe is for drinking water. A method of using the resin composition of claim 1 for producing a water pipe. Resistant to chlorine-containing water, A resin composition comprising 0.05 to 100 parts by weight of a polyolefin resin, 0.1 to 100 parts by weight of a pigment and a copolymer resin prepared from a monomer having an α, β-unsaturated double bond and a dibasic acid having an unsaturated double bond or an anhydride thereof. . The resin composition according to claim 13, wherein the monomer having an α, β-unsaturated double bond is a copolymerizable α-olefin. The resin composition according to claim 13, wherein the dibasic acid or anhydride having an unsaturated double bond is maleic acid or maleic anhydride. The resin composition according to claim 13, wherein the copolymer resin is a copolymer prepared from alpha -olefin and maleic anhydride having 10 to 20 carbon atoms. The resin composition according to claim 13, wherein the pigment is a blue pigment. 18. The resin composition of claim 17, wherein the blue pigment is a phthalocyanine blue pigment and / or an indanthrene blue pigment. The resin composition according to claim 18, wherein the phthalocyanine blue pigment is a phthalocyanine copper blue pigment. Water pipe obtained by molding the resin composition of claim 13 The water pipe of claim 20, wherein the water pipe is for drinking water. Method of using the resin composition of claim 13 for producing a water pipe